Apparently this happened Sunday night at Clive Davis' pre-Grammy party in Los Angeles, and the target was Jonah Hill's manager-brother, Jordan Feldstein, according to E! News.

Reportedly Feldstein — who also manages Maroon 5 — has been having a spat with Sharon's daughter Kelly. Apparently Kelly and Feldstein revisited their feud before Kelly walked away and her mom decided to get involved.

Photos from the event show Sharon hurling a stream of water at Feldstein (and over Sara Bareilles, who got caught in the crossfire).

“They were going back and forth and then all of sudden, food was flipped onto Jordan,” a witness told E!. “He got up to walk away and then Sharon threw a glass of water at him.”

E! reported the cause of the friction between Feldstein and Kelly Osbourne is a mystery, but has been happening for some time.

Feldstein made news in November when he married Clint Eastwood's daughter Francesca Eastwood in Las Vegas, and it was annulled a week later.